Paper-supporting roll in typewriting or telegraph machines writing on paper strips



G. BECCIO Nov. 19, 1940. 2,221,858

PAPER-SUPPORTING ROLL IN TYPEWRITING OR TELEGRAPH.

MACHINES WRITING ON PAPER STRIPS Filed April 22. 1938.

I Patented Nov, 1 9, 1940 PATENT" .0FFIciruna-surron'rnva' ROLL 1N mswmzr- ING on. TELEGRAPH Macmrms wm'rma ON PAPER STRIPS Giuseppe Beccio, Ivrea, Italy, assignor to Firm Ing. O. Olivetti & C S. 4., Ivrea, Italy Application April 22, 1938, Serial No. 203,498

In Italy August 5,

'1 Claims. (o 197-125) In certain kinds of typewriting machines and especially in telegraph machines it .is sometimes required to write on a narrow strip.of-paper,.

provided with an adhesive for gluing said strip to printed sheets. In such cases the machine cannot be provided with the conventional paper abutting or bearing roll, but must have a roll with a flat supporting surface, such as on small anvils, against which the strip, unrolling from a bobbin and caused to advance step by step, may

bear and thus undergo the impactsofjthe type bars carrying the characters. In order to obtain a clean impression of the letters,the support must be resilient and slightly yielding, as are ordinary typewriting rolls covered by a layer of rubber; on the other hand, however, when the I the conditions of the roll being therefore better r and more eflicient than in usual typewriting machines, wherein the rubber of the rolleradto vancing by steps together with the paper wears off unevenly,in the known manner.

The attached drawing shows diagrammatically embodimentsof the inventionjand in which- 1 18, 1 is a front view of one embodiment of as the device showing the roll'and two elements transmitting, rotational and longitudinal displacementtosaid roll.

Fig. 2 is a front view of another embodiment of the device showing the roll and a single e1e-.

o ment imparting both rotation and longitudinal displacement to the roll.

Fig. 3 is a partial'sectional view of the embodimentof Fig. land also includes the type bar and tape support.

5 In the drawing, there is'provided paper strip l upon which the type barworks, which strip is guided through opposite supporting forks 2, and passes in front of the rubberized roll 4 at a very small distance therefrom, so that forwardmotion of the paper may freely take place, said paper being slightly displaced to bear against said roll under the impact of the type bar. The roll 4 carriesj laterally a-follower, such as a grooved pulley'll, said roll and followerbeing coupled or rigidly connected so as to form a single piece pivotedto rotate freely on shaft .5.

1 The shaft 5 is supported by a frame 0. Parallel tothe shaft 5 and mountedon the frame [is a shaft I guided at one end in a bearing 8 of the frame, whilst at the other end it is pivoted in a 8 slot milled in the side of the frame 6 and extending somewhat vertically so as to guide the shaft transversely, leaving it free to be displaced vertically under the action of a spring i0 extending between a pin II and shaft I, and carried by. 10 the latter so as not to hinder its rotation. The"- shaft 1 has a central part It slightly thicker than the remaining portion and which is shagreened. This 'part l8. engages the periphery of the roll 4, thus pressing against the rubber layer. On shaft 16 1 is also rigidly fixed a wobble disc I! provided. with a hub l3. The bore of the hub is not perpendicular to the disc but is somewhat inclined, so that the disc I! inclines to the'axis of said shaft I and, by rotating with the latter, performs lo oscillatory or reciprocable movements. As said disc engages with its periphery in the groove of the pulley I, therefore, at every rotation of the disc l2 the pulley l4 and the roll 4 coupled therewith are forced to perform a longitudinal dis- :5 placement sliding on the shaft 5. Of course the inclination-of the disc flange I2 is selected in relation to the length of the generatrices of the roll 4, so that the paperstruck by the type bar may always bear against the rubberized roll in, any position of its longitudinal" displacement. The shaft I is rotated by a couple of bevel gears l5 and It, the latter being driven by a shaft I] which is caused to .turn intermittently by the same mechanism (not shown) which determines a the p gression of the paper strip. By this way, shaft 1 is made to rotate duringthe interval between two strokes, remaining inactive at the instant of each stroke.

Each rotational stepwise movement of shaft 'l a, would correspond to a constant angular forward movement; if, however, the diameter of the shagreened part I! on shaft I is aliquant with respect to the diameter of roll 4, the latter will then rotate progressively without regular relation to the rotation of shaft 1 so that all points of roll 4' willwear off successively and in. accordance with each point of the strip where the typing .eifect takes place. Adding to this the longitudinal displacement mentioned above the go result is that the whole peripheral surface of the roll 4 is utilised under thesame conditions and equal at every point. The pressure of the shagreened portion I8 of the shaft 1 against the ,roll4, being brought about by the spring [0, does not vary because of the-slight wearing off of the rubber layer and, therefore, the driving conditions are always constant. Of course the diameter of the disc flange-l2 must be such that the'latter should not touch the bottom of the groove so as not to prevent the pressure of the shagreened portion I8 against the rubber layer of roll 4.

In the embodiment illustrated in Fig. 2 the rotation of the roll 4 is not caused by the frictiona1 engagement of the shagreened portion of the shaft 1 with the periphery of said roll 4. Said shagreened portion l8, therefore, has been omitted and the rotation of the roll 4 isdetermined directly by friction of the disc l2 against the bottom of the groove of the pulley i4. By selecting a diameter of the disc flange having no common submultiple with the diameter of the pulley-,- the above advantages and others are obtainable. Firstly, the friction of the roll 4 against the shagreened surface l8 during the movementsof longitudinal displacement of the roll 4 and the consequent cause of wearing ofi of the rub ber layer are eliminated; an exact proportion between rotary motion and axial displacements is obtained, both being determined by the same element; it is finally much easier to proportion the diameter of the disc flange l2 and pulley l4 for obtaining the most convenient unitary rotations of the paper abutting roll.

Another important advantage of theinvention is that the roll 4 constitutes with'respect to the type bars an element of the conventional roll. The known curvature which is given to the types for allowing the same to engage perfectly with' the paper abutting surface is the same which is required in a normal typcwriting machine pro- 40 vided with a paper supporting roll carried on a carriage; it is possible, therefore, with no alteration either in the kinematic typewriting arrangement, or in the types mounted on the machine, to substitute the device hereinbefore described for the conventional carriage, thus changing from the typewriting on a. sheet to the typewriting on a strip of paper and vice-versa.

- What I claim is:

1. A device of the character described for use in typewriters and like machines comprising a roll, a shaft, said roll being freely rotatable and freely axially displaceable on said shaft, 2. grooved pulley adjacent said roll and. coupled therewith, a wobble ,disc frictionally engaging said pulley and means for intermittently driving said wobble disc, for imparting rotation and reciprocable movement to said roll.

2. A device of the character described for use in typewriters andlike machines comprising a. roll, a shaft, said roll being freely rotatable and axially displaceable on said shaft, a grooved pulley adjacent said roll and coupled therewith,a wobble disc frictionally engaging said pulley, the

diameterof said disc being aliquant with respect to the diameter of said roll, and means for intermittently driving said wobble disc, said disc imparting rotation and reciprocable movement to said roll.

3. A device of the character described for use .70 in typewriters and like machines comprising a rubberized roll, a first shaft, said roll being free- 1y rotatable and axially displaceable on said first shaft, a grooved pulley adjacent said roll and coupled therewith, a second shaft provided with a frictional surface opposite said roll and engaging said roll, a wobble disc on said second shaft for engagement with said pulley, and means for. intermittently driving; said second shaft, said disc imparting reciprocable movement to said roll, and said frictional engaging surface imparting rotation to said roll when said second shaft is driven by said driving means.

4. A device of the character described for use in typewriters and like machines comprising a rubberized roll, a first shaft said roll being freely rotatable and axially displaceable on said first shaft, a grooved pulley adjacent said roll and coupled therewith, a second shaft provided with a frictional surface opposite said roll and engaging said roll, a wobble disc adjustable on said second shaft for engagement with said pulley, the diameter of said disc being aliquant with respect to the diameter of said roll, and means for intermittently driving said second shaft, said disc imparting reciprocable movement to said roll, and said frictional engaging surface imparting rotation to said roll when said second shaft is driven by said driving means.

5. A device of the character described for use in typewriters and like machines comprising a frame, a first shaft fixedly supported on said frame, a roll freely rotatably and axially displaceable on said first shaft, means for rotatin and axially displacing said roll including a second shaft, frictional engaging means, and means for intermittently driving said second shaft, a portion of said frictional engaging means being positioned on said first shaft and coupled therewith, and the remaining portion of said frictiona1 engaging means being secured for rotation with said second shaft, and means connected to said second shaft for engaging the portions of said frictional engaging means with each other.

6. A device of the character described for use in typewriters and like machines comprising a rubberized roll, a first shaft fixedly supported on a frame, said roll being freely rotatable and axially displaceable on said first shaft, a grooved pulley adjacent to said roll and coupled therewith, a second shaft, means intermittently driving said second shaft, a wobble disc adjustable on said second shaft for engagement with said pulley, the diameter of said disc being aliquant with respect to the diameter of the groove of said pulley, said disc imparting rotation and reciprocable movement to said pulley and to said roll coupled therewith when said disc is driven by said means through said second shaft.

7. A device of the character described for use in typewriters and like machines comprising a frame, a roll, a first shaft fixedly supported on said frame, said roll being freely rotatable and axially displaceable on. said first shaft, a grooved pulley adjacent said roll and coupled therewith, asecond shaft, a wobble disc on said second shaft, means for intermittently imparting rotation to said second shaft, and resilient means connected to said second shaft for pressing the periphery of said wobble disc against the groove of the said pulley on said first shaft.

GIUSEPPE 'BECCIO. 

